Valve timing
- 3. Bottom dead center.
That point where piston goes
maximum downward
- 6. Piston starts before 8 degree
from TDC
Inlet valve open
Exhaust valve closes
- 7. Piston starts compression up to 30
degree from BDC
Both valves remains close
- 8. Before TDC spark provided by spark
plug
About 8 degree before
- 10. Before 35 degree from BDC
Only exhaust valve open